Η παρούσα εργασία διαπραγματεύεται το Σύστημα Παρουσίας και Στιγμιαίου Μηνύματος (Presence and Instant Messaging System) πάνω σε αρχιτεκτονικά πλαίσια που στηρίζονται στο πρωτόκολλο SIP, π.χ. το IMS. Σκοπός μας είναι μέσω της εφαρμογής που υλοποιούμε, να μπορεί ένας χρήστης να απολαμβάνει την υπηρεσία παρουσίας με τη βοήθεια γραπτού κειμένου (text). Στο Κεφάλαιο 1, δίνεται μια εισαγωγή σχετικά με τις έννοιες αλλά και τις οντότητες που πλαισιώνουν το μηχανισμό αυτό. Εν συνεχεία, παραθέτουμε την αρχιτεκτονική του συστήματος, δηλαδή τη γραφική διεπαφή, με την οποία ο χρήστης αλληλεπιδρά. Στο Κεφάλαιο 3, ακολουθεί λεπτομερής περιγραφή της υλοποίησης και δίνονται επεξηγήσεις για συγκεκριμένα σημεία του κώδικα. Στο κεφάλαιο 4, δύο χρήστες τρέχουν παράλληλα την εφαρμογή και παρουσιάζεται το σύστημα μας τόσο από τη μεριά των χρηστών όσο και από τη μεριά του εξυπηρετητή. Στο Κεφάλαιο 5, γίνεται αναφορά σε πολύπλοκα σενάρια και δίνονται περιγραφικές λύσεις που μπορούν να αποτελέσουν βάση για τον αναγνώστη εκείνο που επιθυμεί να διευρύνει περισσότερο τους ορίζοντές του στο συγκεκριμένο αντικείμενο. Τέλος, στο παράρτημα βρίσκεται ο πηγαίος κώδικας καθώς επίσης και τα αρχεία που χρειάστηκε να τροποποιήσουμε προκειμένου ο εξυπηρετητής να μας προσφέρει την αντίστοιχη υπηρεσία. / This thesis discusses the "Presence and Instant Messaging System" on an architectural framework based on the protocol SIP, eg IMS. Our goal is to implement an application that a typical user can interract with. This application provides this service using written text (text). Chapter 1 is an introduction to the concepts and entities in the specific area. Subsequently, we present the architecture of the system, ie the graphical interface of our application. In Chapter 3, we give a detailed description of the implementation plus explanations on specific parts of the code. In Chapter 4, two users run simultaneously our implementation.In Chapter 5, we refer to complex scenarios and we give solutions for them.Finally, in the Annex we attach the source code as well as the files that we had to modify for the server in order to offer us this service.

Σκοπός μας είναι να μελετήσουμε, αναπτύξουμε και να υλοποιήσουμε μία υπηρεσία PubSub με την βοήθεια του εργαλείου ανοικτού κώδικα Agsxmpp SDK. Η υπηρεσία αυτή θα είναι διαθέσιμη σε όλους τους χρήστες ενός συστήματος και θα υπάρχει η δυνατότητα στον καθένα να δημιουργεί αναρίθμητα θεματικά «κανάλια» μηνυμάτων κάθε τύπου. Κάθε χρήστης θα έχει δικαίωμα εγγραφής σε ένα τέτοιο «κανάλι» και έτσι θα έχει την δυνατότητα να λαμβάνει τα μηνύματα και τις ανανεώσεις που δημοσιεύονται σε αυτό. Σαν «κανάλια» ορίζουμε τα Nodes, η εγγραφή ορίζεται ως subscribe, η δημοσίευση ως publish και τέλος την ειδοποίηση / παραλαβή ως notification. / Our aim is to study, develop and implement a service with PubSub the help of open source tools Agsxmpp SDK. The service will be available to all users of a system and possible for anyone to create numerous thematic "Channels" each message type. Each user will have the right recording in such a "channel" and thus is able to receive messages and updates posted on this. like "Channels" are defined as Nodes, the record is defined as subscribe, the publication to publish and finally notification / receipt as notification.

Magister Artium - MA / Contemporary research has pointed to the importance of social media in the lives of young people today. This project aims to explore the emerging discourse conventions and generic structures of chat conversations on social networking media applications such as MXit, BlackBerry Messenger (BBM) and WhatsApp. The data for this project was acquired from undergraduate students between first- and third-year of study at the University of the Western Cape across four years (2010-2012 and 2014). The data is of three types: instant messaging chats which were collected from 2010 to 2012, and questionnaires and a focus group interview which were conducted in 2014. The main theoretical frameworks used for this project are genre and register theory by Martin and Rose (2003), Eggins and Slade (1997), Chandler (1997), Eggins (2004), Halliday and Hasan (1985). Bock (2013) and Spilioti (2011) were also used for the chat analyses. In this project I argue that although generic structures in instant messaging (IM) are conventionalised they still show a great amount of hybridity and fluidity. One of the main findings illustrates how different participants choose to begin and end their chats, whether it is with or without a greeting, and although they may be flouting the conventions of IM chatting they are not necessarily considered to be impolite. Furthermore, the findings of this project explores how the evolution and advancement of technology has contributed to the style of chatting as well as the norms of instant messaging as a genre.

Digital evidence is becoming more and more frequent and important in investigations carried out by the police. To make the correct judgements, the police force needs to know what one can do with ICQ and in what ways it can be exploited. This thesis aims to point out weaknesses in ICQ that can aid the police in their work. But these weaknesses can not only be used by the police, also crackers can perform malicious acts with them. Therefore, I investigated if the use of ICQ resulted in non-secure sessions. To investigate ICQ’s security, I divided a session into an authentication phase, sending of messages, and the protection of stored messages in a history file. While investigating ICQ, I sniffed its Internet traffic and monitored files on the computer’s hard drive with MD5 checksums. I have investigated the following three ICQ applications: ICQ Pro 2003a, ICQ2Go and the Linux clone Licq. The result of the entire investigation showed that ICQ had a non-secured authentication phase, non-secured messages and no protection for stored messages. From these results the main conclusion was derived: The use of ICQ resulted in non-secure instant messaging sessions. Your ICQ account can be hijacked and another person can impersonate you and send messages that you dislike. Also, your messages can be intercepted on the Internet and their content can be read. If your computer is compromised, all your previous messages on ICQ Pro 2003a and Licq can be read. / Martin Kling Fältv 17 SE-291 39 Kristianstad martinkling@hotmail.com 0733691999

Opera är främst en webbläsare, men innehåller även klienter för bl.a. mail och chat. Innan den här rapporten skrevs saknades dock en klient för instant messaging-protokollet Jabber. Denna rapport beskriver arbetsgången och resultatet av utvecklandet av en Jabberklient till Opera. Eftersom det inte fanns nog med tid att utveckla en fullfjädrad Jabberklient beslutades det att målet skulle vara ett s.k. ”proof of concept”. Kraven sattes till grundläggande instant messagingfunktionalitet, som närvarostatushantering och möjlighet att skicka och ta emot meddelanden. Målet uppfylldes och resultatet blev en Jabberklient med grundläggande funktionalitet. I enlighet med direktiven lades relativt lite fokus på gränssnittet. Klienten har kända brister och användarvänligheten går att öka. Resultatet skulle kunna utgöra grunden för en komplett Jabberklient. Kvar att göra är att förbättra gränssnittet för att matcha resten av Opera i användbarhet. Alla krav i Jabberspecifikationen bör också uppfyllas, speciellt eftersom företaget är stolt över att Opera följer standarder väl1. För att inte vara sämre rustad än andra Jabberklienter bör även extra funktionalitet läggas till, såsom samtalshistorik, filöverföring och möjligheten att använda andra instant messaging-protokoll via Jabberkontot. / Opera is first and foremost a web browser, but it also has e-mail and chat clients. Before this thesis was written however, it did not have a client for the instant messaging protocol Jabber. This thesis describes the workflow and the results of the development of a Jabber client for Opera. Since there wasn’t enough time to develop a full-featured Jabber client, it was decided that the goal would be a proof of concept. The requirements were basic instant messaging functionality, which means the proper handling of presence information and the ability to send and receive instant messages. The goal was achieved and the result was a Jabber client with basic functionality. In accordance with the directives, the user interface was not a primary focus. The client has known flaws and the usability is not as good as it could be. The result could be used as the foundation of a releasable Jabber client. One of the things left to do is to improve the user interface so it matches the usability of the rest of Opera. All the requirements of the Jabber specification should also be fulfilled, especially since the company takes pride in the standards compliance of Opera2. In order to match the features of other Jabber clients, extra functionality should be added as well. Some examples would be message history, file transfer and the ability to use other instant messaging protocols through the Jabber account.

RSS is a format for easy information sharing between computers. A RSS-file, also known as a feed or a channel, consist of a list of items. The items are structured with XML-tags and have to be processed in some way before it can be read. RSS¬readers, web-browsers with RSS support and e-mail-clients with RSS support can be used to display the feed. This thesis is focused to investigate if RSS can be used within an enterprise for internal communication. We look at different computer based communication tools that are available today and compare them with RSS. All the different tools has there advantages as well as disadvantages, we have tried to find out if there is room for one more information channel within an enterprise. Our study shows that RSS is not suitable as a stand alone solution for internal combination. RSS main strengths lies in mass information that has to be pushed out in one direction.

Magister Educationis - MEd / Previous studies on the academic utilisation of mobile devices in South Africa have rendered some invaluable insights into the rationale and different ways students utilise mobile technologies in and outside the classroom. However, these studies have addressed issues about social practices of adoption in high schools that emphasise tutor-directed, instant messagingmediated supply of supplementary tuition/training in subjects like science and mathematics. Consequently, insufficient attention has been devoted to understanding the dynamic complexities of implementing mobile learning (m-Learning) projects in tertiary institutions. This research contributes to the m-Learning discourse by exploring a collaborative m-Learning perspective, through the pedagogical application of WhatsApp, a special-purpose instant messaging service implemented at a University of Technology in South Africa. This research paper argues that mobile instant messaging (MIM) may create alternative academic discussion platforms for the students’ collaborative interactions outside the classroom, which implies the transformation of pedagogical delivery. The FRAME model was utilised as the theoretical lens for this study. An interview instrument was developed based on the FRAME model constructs. Face-to-face semistructured interviews were conducted with twenty participants. The findings suggest improved academic participation, the promotion of collaborative m-Learning for critical thinking, knowledge creation and sharing, as well as fostering effective learning through student-centered approach hence liberal transformation in the lecturer’s mode of instructional delivery.

Master’s thesis is trying to create opensource IM application for communication in Jabber network. In nowadays it is getting more and more popularity as at providers, so mainly at end users. In first half of thesis are explained basics of whole issues and in second half is described resulting application, which has been created by using of object oriented programming language Java. Java is very extended between programmers for her simplicity and great support. Thanks this is available a many external libraries and extensions. Application has been written on Smack library in version 3.04 and VoIP module on JMF (Java Media Framework). Graphic interface has been created by using of standard Java visual components (javax.swing).

Gemeinsamer Workshop von Universitaetsrechenzentrum und Professur Rechnernetze und verteilte Systeme (Fakultaet fuer Informatik) der TU Chemnitz. Workshop-Thema: Infrastruktur der ¨Digitalen Universitaet¨ Zur unmittelbaren Kommunikation zweier oder mehrerer Kommunikationspartner werden heute sogenannte Instant Messaging Systeme eingesetzt. Der Vortrag zeigt zwei moegliche Ansaetze fuer ein Protokoll, das diese Art von Kommunikation bewerkstelligen kann. Zum einen handelt es sich um das Protokoll einer freien Implementierung eines IM Systems, Jabber. Zum anderen ist dies das Protokoll eines im Rahmen einer Diplomarbeit an der Fakultaet fuer Informatik entstandenen IM Systems, Locom.

Instant Messaging Mobile (IM) applications are now ubiquitous and predominant in most person-to-person communications, especially intimate and sensitive conversations. This growing popularity of instant messaging is linked directly to the characteristics of speed, immediate and convenience that an IM holds which is a strong appeal for anyone that wants to communicate and collaborate in real-time with others. However, it is these features including presence awareness (the ability for IM users to know who is online and available), group chats, share media, links, and stream content as well as text and voice messages, that exposes the IM apps to the concerns of privacy and security. This essay aims to study the behavior of higher education students towards privacy and security as it concerns the use of instant messaging applications when communication informally and formally.To gather the desired data, a quantitative survey was created and distributed electronically at the University of Skövde in Sweden. Through the statistical analysis, this study presents the attitude of the participants towards the security and privacy of mobile IM applications. In conclusion, this report showed that the behavior of Swedish students towards digital security and privacy and the use of mobile IM applications were of low concern but not alarming. The analyzed results give a fair picture of the reasons for the choice of IM apps, the uses of the apps and the participant's knowledge about security and privacy. While there was some level of concern about who else could read messages sent via these IM devices between intended parties, the decision of which IM app participants had a preference for was not driven by privacy or security concerns. Furthermore, the majority of the participants believed that communicating with the IM app could be used for purposes other than informal messaging. This is significant because the student population will become part of the workforce soon and will handle sensitive, proprietary, and confidential information.